Good morning all!
I discovered a version of libreelec mod special Audiophile for Raspberry pi 2/3, this one works impeccably with my DAC USB Mydac MICROMEGA.
I no longer have a sound problem in the Netflix addon or on some FLACs.
Here is the link of the translated page (Koreen origin):
original:
Github:GitHub - parkmino/audiophile: Mino's Audiophile Tunings for Linux and Open Souce Software
Very good Audio MOD